Flame retardant compositions with a phosphorated compound
View Patent ↗Flame retardant compositions that are halogen-free or substantially halogen-free are disclosed. In certain examples, the compositions comprise a halogen-free or substantially halogen-free epoxide and one or more phosphorated compounds. In some examples, the phosphorated compound comprises an average particle size less than 10 microns. In other examples, the phosphorated compound provides a surface area of 78.5 μm 2 to about 1965 μm 2 . Prepregs, laminates, molded articles and printed circuit boards using the compositions are also disclosed.
1. A substantially halogen-free composition, comprising:
an epoxide; and
a flame retardant amount of chemically combined phosphorous from a phosphorated compound having an average particle size of less than about 10 microns, the substantially halogen-free composition having a flame retardancy of V-0 as defined by the UL-94 burn test,
wherein an amount of the epoxide is about 40% to about 90% by weight, and wherein the amount of the phosphorated compound is about 5% to about 30% by weight.
2. The composition of claim 1 having a glass transition temperature of at least about 120° C.
3. The composition of claim 1 having a peel strength of at least about 4 lb/inch width as tested by IPC-TM-650 2.4.8C.
4. The composition of claim 1 having a dielectric constant at 1 MHz (50% weight resin) of less than about 5.0 as tested by IPC-TM-650 2.5.5.3C.
5. The composition of claim 1 having a dielectric dissipation factor at 1 MHz (50% resin content) of about 0.035 or less as tested by IPC-TM-650 2.5.5.3C.
6. The composition of claim 1 , wherein the epoxide is a polyepoxide.
7. The composition of claim 6 , wherein the polyepoxide is a difunctional epoxide, a tetrafunctional epoxide, or an aromatic multi-functional epoxide.
8. The composition of claim 1 , further comprising a catalyst selected from the group consisting of imidazole, 1-methylimidazole, 1,2-dimethylimidazole, 2-methylimidazole, 2-heptadecylimidazole, 2-ethyl-4-methylimidazole, 2-undecylimidazole, 1-(2-cyanoethyl)-2-phenylimidazole, diethyltoluenediamine, tris(dimethylaminomethyl)-phenol, 3-phenyl-1,1-dimethyl urea and mixtures thereof.
9. The composition of claim 1 , further comprising at least one co-flame retardant.
10. The composition of claim 1 , wherein the phosphorated compound is an organic phosphate.
11. The composition of claim 1 , wherein the phosphorated compound has a formula of :
in which R 1 , R 2 and R 3 each is independently selected from the group consisting of alkyl, aryl, and alicyclic and heterocyclic groups that include nitrogen, oxygen and/or phosphorous.
12. The composition of claim 1 , wherein the phosphorated compound comprises particles with a surface area of at least about 78.5 μm 2 to about 1965 μm 2 .